Beschreibung:
<jats:p>The variations of the 63Cu nuclear magnetic resonance (NMR) spectra have been studied for the powder mixtures of Cu59Zr41 after different times of ball milling. Other relevant samples such as the ball-milled pure copper powders and the prealloyed intermetallic compound Cu59Zr41 have also been investigated. Ball milling the Cu–Zr powder mixtures influences all of the 63Cu NMR spectral parameters of the samples. The most pronounced changes are in the position and intensity of the 63Cu resonance peak, which compares with the characteristics of Cu59Zr41 powders unmilled and other samples. During amorphization progress, a new broad 63Cu resonance peak around K=1490 ppm developed in the milled Cu59Zr41 powder samples. The detailed physical discussion on correct identification of these peaks has proceeded. The spectrum of 63Cu resonance in the ball-milled Cu59Zr41 is a superposition of two resonance peaks, the narrow one with Knight shift of about 2400 ppm corresponding to the resonance in unalloyed copper powders, and another broader one with Knight shift value around 1490 ppm which is attributed to the resonance of active nuclei 63Cu in the amorphous phase. Compared with results of x-ray diffraction, the 63Cu NMR analysis seems more sensitive to the subtle microstructural changes of the Cu–Zr powder mixtures during mechanical alloying. The importance of the NMR measurement to reveal the amorphization mechanism by ball milling has been emphasized briefly.</jats:p>